Introductions

Hello all, I am a long time fan of BMW's. My first was a '78 320i that was envied by many. I now have a '90 535i and I love that car as well. While I'm comfortable under the hood, I'm no expert. (I keep seeing E34, E39 ... whatever, what E is a '90 535i?) Thanks to everyone in advance for all the help that I'm sure I'll get!